Here are the under-floor pipes that carry chilled water around the data centre.

The water is pumped into units at the edge of the data halls. The units use the water to cool air that has been warmed by the computers. The cooled air is then pushed back into the data halls through grilles in the floor.

Electronically controlled fans only provide the chilled air to the parts of the data centre that need cooling, reducing energy usage.

The centre is fitted with state-of-the-art security and has undergone an array of checks to allow it to process data up to government level.

CCTV cameras are plugged into an intelligent computer system able to recognise and raise alerts about suspicious behaviour such as running or someone fiddling around inside a bag.

Every person entering the centre has an identity check inside its double-gated entrance.

The centre has been sited for maximum peace-of-mind - away from terrorist threats inside the M25, on land that has not flooded in more than 100 years and with neighbours who have been screened for security risk and fire hazards.

The centre is protected by two fire detection systems, the first is an ultra-sensitive system that can pick up on a match being lit and the second is comparable to a home fire detection system that detects heat or smoke.

Once triggered the system will release inert Argon gas that will starve the flames of oxygen and put out the fire.